PDA

View Full Version : please help for choose best carburetor....



saeed_bestboy_21
03-31-2012, 05:44 AM
hi , i have a pontiac formula 77 with engine 400 ( 6.6 )
and i want to buy a Carburetor but i don't know what Carburetor is better for my car. i don't want to use my car for racing and professional drag , it just beginner street race or street drag :)
what the holley carburetor is better for me?
and whats Difference between the Mechanical secondaries and vacuum secondaries ?
my engine parts is standard and its not aftermarket.
please help me. thank you :)

Danny Cabral
03-31-2012, 06:33 AM
Which Holley carburetor is better for me?
http://www.holley.com/applications/CarburetorSelector/CarbSelection.asp (Online Carburetor Selector)


...and what's the difference between the Mechanical secondaries and vacuum secondaries?
http://www.holley.com/TechService/FAQ.asp (Scroll down to "QUESTION How do I know if a vacuum or mechanical carburetor is best for me?")

saeed_bestboy_21
03-31-2012, 01:36 PM
thank you.
i use the carb selector , but its 7 carburetor introduce to me , but i dont know what in beter for me.
0-85670 ( 670cfm ) , 0-1850SA ( 600cfm ) , 0-1850S ( 600cfm ) , 0-1850C ( 600cfm ) , 0-85570 ( 570 cfm ) , 0-81670 ( 670 cfm ).
0-4776c ( 600 cfm )
some of them are dual pomp , and some of single pomp!!! , what carburetor better ??

Danny Cabral
03-31-2012, 02:55 PM
I used the carb selector but the 7 carburetors introduced to me...I don't know which is better for me.
0-85670 (670cfm), 0-1850SA (600cfm), 0-1850S (600cfm), 0-1850C (600cfm), 0-85570 (570 cfm), 0-81670 (670 cfm), 0-4776c (600 cfm).
Tell us more about your engine combination (how it's built, horsepower, etc.).
With 400 cubic inches, I suggest at least a 670 CFM carburetor.



Some of them are single pumper and some are double pumper!!! What carburetor is better ??
I don't want to use my car for racing and professional drag, just beginner street race or street drag.
According to your statement, you'd be better off with an electric choke, vacuum secondary (single pumper) carburetor.
I suggest their new line of carburetors, the Ultra Street Avenger. Do you want a carburetor with a zinc body or aluminum construction?

saeed_bestboy_21
03-31-2012, 04:44 PM
my engine is v8 and 400 c.i.d and 220 hp , expected maximum RPM (Red line) is 5000 and the all of parts are standard ( not aftermarket ) ( just have headers ) ( my car is pontiac formula 1977 )
but i think at all , dual pumper is better single pumper. :)
670 isn't too much for my engine?!!
the carburetor body is not important. the good performance and Acceleration is important.

Danny Cabral
03-31-2012, 05:00 PM
My engine is v8 and 400 c.i.d and 220 hp, expected maximum RPM (Red line) is 5000 and
the all of parts are standard (not aftermarket - just have headers). My car is Pontiac Formula 1977.
670 isn't too much for my engine?!!
That's why I asked about your engine.
600 CFM (vacuum secondaries) is enough.

saeed_bestboy_21
04-01-2012, 01:29 AM
i think this carburetor is good for my car , http://www.holley.com/0-85570.asp
What is your opinion?

Danny Cabral
04-01-2012, 06:32 AM
If you don't mind a manual choke, it will suit you fine.

saeed_bestboy_21
04-01-2012, 07:11 AM
I don't think the difference is between manual choke and Electric Choke for me . ( but i`m not sure )

Danny Cabral
04-01-2012, 07:25 AM
Well, that's fine. Personally, I would not want to install a manual choke cable:

http://www.holley.com/45-228.asp
194

saeed_bestboy_21
04-01-2012, 07:44 AM
ok :)
Thank you very much for help , my friend ;)
Have a great help to me. :)
i choose holley 0-83570 .

Danny Cabral
04-01-2012, 01:06 PM
You have been a great help to me. :) I chose Holley 0-83570 (http://www.holley.com/0-83570.asp).
You're welcome and good final choice.

saeed_bestboy_21
04-02-2012, 10:43 AM
excuse me , another question :)
What the adapter kit or adapter plate should I buy ? for holley 0-83570 ?

Danny Cabral
04-02-2012, 11:02 AM
Excuse me, another question. :)
Which adapter kit or adapter plate should I buy? for Holley 0-83570?
I'm assuming you have a spread-bore intake manifold?
If so, you'll use Holley #17-6 spread-bore to square-bore adapter:

http://www.holley.com/17-6.asp
195